The Decembrist revolt or the Decembrist uprising took place in Imperial Russia on 26 December 1825. Russian army officers led about 3,000 soldiers in a protest against Tsar Nicholas I's assumption of the throne after his elder brother Constantine removed himself from the line of succession. Because these events occurred in December, the rebels were called the Decembrists. The uprising, which was suppressed by Nicholas I, took place in Peter's Square in Saint Petersburg. In 1925, to mark the centenary of the event, the square was renamed Decembrist Square; but in 2008 the name was changed back to its original name, Senate Square.